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The analysis of experimental and simulation breakthrough times showed that the difference observed between these two breakthrough times is proportional to the feed flow rate employed. Also, for this situation, it was observed that: 𝑒𝑥𝑝𝑏𝑟𝑒𝑎𝑘𝑡h𝑟𝑜𝑢𝑔h 𝑡𝑖𝑚𝑒 = 0,9 𝑠𝑖𝑚𝑏𝑟𝑒𝑎𝑘𝑡h𝑟𝑜𝑢𝑔h 𝑡𝑖𝑚𝑒 (4.3) When it comes to the analysis of the shape of the breakthrough curve, it can be observed that the slopes of the experimental and simulation curves present a higher difference among them than what was observed for the simulation where variation of the feed pressure of the mixture was studied. For feed pressures of 16 atm, bigger deviations between experimental and simulation breakthrough curves is observed. For this reason, it was agreed to performed the simulations with other activity models and then compared the results with the previous ones, which considered the ideal gas activity model. The results obtained can be seen in Figure 4.6. Two new simulations were performed for the binary mixture of hydrogen and methane at a feed pressure of 16 atm and a feed flow rate of 6.8 SLPM employing two different activity models separatelly, the Virial model and the Redlich-Kwong model. The results from these simulations showed that the activity models have no visible impact on the breakthrough curve for the conditions and models being employed (Figure 4.6). Figure 4.6 - Comparison of the results obtained for a feed pressure of 16 atm using different activity model for a binary mixture of hydrogen and methane A binary mixture of hydrogen and carbon monoxide was used as a feed and simulations with the input conditions showed in Table 4.3 were applied with the aim of observing if the same deviations observed, for the binary mixture H2/CH4, also took place for H2/CO mixture. The analysis of the data presented in Figure 4.7 shows that the deviations for the binary mixture of hydrogen and carbon monoxide are different from the deviations obtained for the simulations with the binary mixture of hydrogen and methane. The results provided by gPROMS® for the present simulation show a smaller deviation when it comes to the Pressure Swing Adsorption for Hydrogen Purification 1 0,95 0,9 0,85 0,8 0,75 0,7 Ideal gas Virial Redlich-Kwong 0 200 400 600 800 1000 1200 1400 time (s) Modelling and Simulation 26 molar fraction (H2)PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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